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Technetium Lanthanum Comparison


Lanthanum Technetium comparison


Periodic Table

Symbol
Tc   
La   

Group Number
7   
11
Not Available   

Period Number
5   
6   

Block
d block   
f block   

Element Family
Transition Metal   
Lanthanide   

CAS Number
7440268   
99+
7439910   
99+

Space Group Name
P63/mmc   
P63/mmc   

Space Group Number
194.00   
5
194.00   
5

Facts

Interesting Facts
  • Original name of Technetium was Masurium.
  • At the time of its discovery it found in sample of Molybdenum.
  
  • Lanthanum metal is highly malleable, ductile and sectile.
  • If exposed to air Lanthanum metal oxidizes rapidly.
  

Sources
Made by Bombarding Molybdenum with Deuterons   
Found in Minerals, Mining, Ores of Minerals   

History
  
  

Who Discovered
Emilio Segrè and Carlo Perriero   
Carl Gustaf Mosander   

Discovery
In 1937   
In 1838   

Abundance
  
  

Abundance In Universe
Not Available   
2 * 10-7 %   
22

Abundance In Sun
~-9999 %   
~0.0000002 %   
25

Abundance In Meteorites
Not Available   
0.00 %   
32

Abundance In Earth's Crust
Not Available   
0.00 %   
19

Abundance In Oceans
Not Available   
0.00 %   
29

Uses

Uses & Benefits
  • Technetium is a radioactive metal and hence it is used for medical studies and other research purposes.
  
  • It has no commercial uses, but its alloys are in high demand. Lanthanum and Nickel alloy is used for the hydrogen gas storage.
  • The best-known use for mischmetal alloy of Lanthanum is; as a ‘flints’ for cigarette lighters.
  

Industrial Uses
NA   
Electrical Industry, Electronic Industry   

Medical Uses
NA   
NA   

Other Uses
Alloys, Nuclear Research, Research Purposes   
Alloys, Mirror Manufacturing   

Biological Properties
  
  

Toxicity
Low Toxic   
Low Toxic   

Present in Human Body
No   
Yes   

In Blood
0.00 Blood/mg dm-3   
37
Not Available   

In Bone
0.00 p.p.m.   
36
0.08 p.p.m.   
24

Physical Properties

Melting Point
2,200.00 °C   
9
920.00 °C   
99+

Boiling Point
4,877.00 °C   
7
3,469.00 °C   
18

Appearance
  
  

Physical State
Solid   
Solid   

Color
Shiny Gray   
Silvery White   

Luster
NA   
NA   

Hardness
  
  

Mohs Hardness
Not Available   
2.50   
14

Brinell Hardness
Not Available   
350.00 MPa   
30

Vickers Hardness
Not Available   
360.00 MPa   
26

Speed of Sound
16,200.00 m/s   
1
2,475.00 m/s   
37

Optical Properties
  
  

Allotropes
No   
No   

α Allotropes
Not Available   
Not Available   

β Allotropes
Not Available   
Not Available   

γ Allotropes
Not Available   
Not Available   

Chemical Properties

Chemical Formula
Tc   
La   

Isotopes
  
  

Known Isotopes
18   
21
31   
8

Electronegativity
  
  

Pauling Electronegativity
1.90   
11
1.10   
99+

Allred Rochow Electronegativity
1.36   
20
1.08   
31

Allen Electronegativity
1.51   
28
Not Available   

Electropositivity
  
  

Pauling Electropositivity
2.10   
99+
2.90   
10

Ionization Energies
  
  

1st Energy Level
702.00 kJ/mol   
36
538.10 kJ/mol   
99+

2nd Energy Level
1,470.00 kJ/mol   
99+
1,067.00 kJ/mol   
99+

3rd Energy Level
2,850.00 kJ/mol   
33
1,850.30 kJ/mol   
99+

4th Energy Level
Not Available   
4,819.00 kJ/mol   
22

5th Energy Level
Not Available   
5,940.00 kJ/mol   
25

Electrochemical Equivalent
0.52 g/amp-hr   
99+
1.73 g/amp-hr   
99+

Electron Work Function
Not Available   
3.50 eV   
31

Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility   
Ionization, Radioactive Isotopes, Solubility   

Atomic Properties

Atomic Number
43   
99+
57   
99+

Electron Configuration
[Kr] 4d5 5s2   
[Xe] 5d2 6s2   

Crystal Structure
Hexagonal Close Packed (HCP)   
Double Hexagonal Close Packed (DHCP)   

Crystal Lattice
HCP-Crystal-Structure-of-Technetium.jpg#100   
DHCP-Crystal-Structure-of-Lanthanum.jpg#100   

Atom
  
  

Number of Protons
43   
99+
57   
99+

Number of Neutrons
55   
99+
82   
99+

Number of Electrons
43   
99+
57   
99+

Radius of an Atom
  
  

Atomic Radius
136.00 pm   
99+
187.00 pm   
8

Covalent Radius
147.00 pm   
37
207.00 pm   
6

Van der Waals Radius
200.00 pm   
28
240.00 pm   
13

Atomic Weight
98.00 amu   
99+
138.91 amu   
99+

Atomic Volume
8.50 cm3/mol   
99+
20.73 cm3/mol   
16

Adjacent Atomic Numbers
  
  

Previous Element
Molybdenum
  
Barium
  

Next Element
Ruthenium
  
Cerium
  

Valence Electron Potential
180.00 (-eV)   
3
40.71 (-eV)   
99+

Lattice Constant
273.50 pm   
99+
377.20 pm   
28

Lattice Angles
π/2, π/2, 2 π/3   
π/2, π/2, 2 π/3   

Lattice C/A Ratio
1.60   
5
1.62   
2

Mechanical Properties

Density
  
  

Density At Room Temperature
11.00 g/cm3   
34
6.16 g/cm3   
99+

Density When Liquid (at m.p.)
Not Available   
5.94 g/cm3   
99+

Tensile Strength
Not Available   
Not Available   

Viscosity
Not Available   
Not Available   

Vapor Pressure
  
  

Vapor Pressure at 2000 K
Not Available   
0.98 (Pa)   
15

Elasticity properties
  
  

Shear Modulus
Not Available   
14.30 GPa   
40

Bulk Modulus
Not Available   
27.90 GPa   
99+

Young's Modulus
Not Available   
36.60 GPa   
99+

Poisson Ratio
Not Available   
0.28   
17

Other Mechanical Properties
NA   
Ductile   

Magnetic Properties

Magnetic Characteristics
  
  

Specific Gravity
11.50   
24
6.17   
99+

Magnetic Ordering
Paramagnetic   
Paramagnetic   

Electrical Properties
  
  

Electrical Property
Conductor   
Conductor   

Resistivity
200.00 nΩ·m   
18
615.00 nΩ·m   
7

Electrical Conductivity
0.07 106/cm Ω   
30
0.01 106/cm Ω   
99+

Electron Affinity
53.00 kJ/mol   
18
48.00 kJ/mol   
23

Thermal Properties

Specific Heat
0.21 J/(kg K)   
29
0.19 J/(kg K)   
32

Molar Heat Capacity
24.27 J/mol·K   
99+
27.11 J/mol·K   
21

Thermal Conductivity
50.60 W/m·K   
30
13.40 W/m·K   
99+

Critical Temperature
Not Available   
Not Available   

Thermal Expansion
7.10 µm/(m·K)   
99+
12.10 µm/(m·K)   
32

Enthalpy
  
  

Enthalpy of Vaporization
660.00 kJ/mol   
6
399.60 kJ/mol   
17

Enthalpy of Fusion
23.01 kJ/mol   
9
6.20 kJ/mol   
99+

Enthalpy of Atomization
649.00 kJ/mol   
8
431.00 kJ/mol   
16

Standard Molar Entropy
181.10 J/mol.K   
2
56.90 J/mol.K   
23

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